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Document and Entity Information - USD ($)
 12 Months Ended
Jan. 31, 2023
Apr. 21, 2023
Jul. 31, 2022
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Jan. 31, 2023    
Entity File Number 1-4488    
Entity Registrant Name MESABI TRUST    
Entity Incorporation, State or Country Code NY    
Entity Tax Identification Number 13-6022277    
Entity Address, Address Line One 1 Columbus Circle, 17th Floor    
Entity Address, Address Line Two Mail Stop: NYC01-1710    
Entity Address, City or Town New York    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10019    
City Area Code 904    
Local Phone Number 271-2520    
Title of 12(b) Security Units of Beneficial Interest in Mesabi Trust    
Trading Symbol MSB    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   13,120,010  
Entity Public Float     $ 357,507,409
Current Fiscal Year End Date --01-31    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000065172    
Amendment Flag false    
Auditor Name Baker Tilly US, LLP    
Auditor Firm ID 23    
Auditor Location Minneapolis, Minnesota